黑龙江省塔河县宝兴沟金矿床地质特征及成矿构造环境  

Geologic Characteristics and Metallogenic Tectonic Environment of the Baoxinggou Gold Deposit in Tahe,Heilongjiang Province

作　　者：李向文[1,2] 杨言辰[1] 王献忠[2] 刘智杰[2] 公维国[2] 

机构地区：[1]吉林大学地球科学学院,长春130061 [2]武警黄金第三支队,哈尔滨150086

出　　处：《吉林大学学报（地球科学版）》2012年第6期1700-1710,共11页Journal of Jilin University：Earth Science Edition

基　　金：中国地质调查局地质调查项目(1212010786005)

摘　　要：黑龙江省塔河县宝兴沟岩金矿床位于上黑龙江前陆盆地南缘,是近年来发现的具较大找矿潜力的岩金矿床。矿床产于浅成侵入岩与砂岩地层接触部位及侵入体内部。矿床地球化学研究表明,闪长玢岩、石英闪长岩与成矿关系密切,两者同属于高钾钙碱性岩石,富集轻稀土元素,Eu异常不明显,富集大离子亲石元素Rb、Th、K,亏损高场强元素Nb、Ta、Ti、Zr和重稀土元素Yb、Y。单颗粒锆石LA-ICP-MS法U-Pb同位素定年结果表明:石英闪长岩成岩时间为(124.92±1.3)Ma;花岗细晶岩测年结果为150～450Ma,推测花岗细晶岩成岩时间可能为156Ma左右。宝兴沟金矿床是在早白垩世由挤压转变为伸展环境的构造-岩浆-热液作用的产物,金矿化作用应发生在107.5～124.92Ma;大兴安岭北段存在一期与早白垩世岩浆活动相伴的金矿化作用。因此,燕山晚期(早白垩世)岩浆活动地段尤其是浅成侵入体发育地区是今后重要的金矿化找矿方向之一。The Baoxinggou gold deposit,located in the south margin of upper Heilongjiang Foreland Basin,is discovered rencently and of great ore prospecting potential.Gold ore bodies are mainly hosted inner the shallow intrusion and its contact zone with sandstone formation.The deposit is closely related to the quartz diorite and diorite-porphyrite.Geochemical studies show that the two types of magmatic rocks associated with gold mineralization belong to high-K and calc-alkaline rocks and they are rich in REE,with no obvious Eu anomaly,while with significantly negative Nb,Ta,T,Zr,Yb,Y and positive Rb,Th,K.The LA-ICP-MS U-Pb isotopic dating of single zircons from the quartz diorite indicates that the age of（124.92±1.3） Ma represents the crystallization age of diorite.In light of the age of granite-aplite varying from 150 Ma to 450 Ma,it can be guessed that its diagenesis age is about 156 Ma.The Baoxinggou gold deposit was resulted from the tectonic-magmatic-hydrothermal process associated with the tectonic stress field transition from compression to extension in early Cretaceous period and the gold mineralization took place in 107.5-124.92 Ma.Meanwhile,it can be concluded that there existed gold mineralization companying with the Cretaceous magmatism in the south part of Da Hinggan Mountains.Therefore,the districts developing the Late Yanshanian（Early Cretaceous epoch） magmatic activities,especially the shallow intrusions are important ore-prospecting targets for further exploration.

关 键 词：金矿床 地质特征 地球化学 成矿构造环境 黑龙江省塔河县 

分 类 号：P618.2[天文地球—矿床学]